Lock for propelling machinery



Jan s0,1940 G. Y.ANDERSON,J Em. ,188 328 LOOK FOR PROPELLING MACHINERYFiled Oct. 22, 1938 5 Sheets-Sheet 2' 4/ M Khaki-50ml:

Trcuo r udn,

M ZWWILNVENTORS Jan. 30, 1940. G. Y. ANDERSON, JR; ET AL I 2,188,328

LOCK FOR PROPELLING MACHINERY Filed Oct. 22, 1938- 3 Sheets-Sheet 3Ffevor kWh son,

5mm? .4. INVENTORS.

BYM,'WY' I ATTORNEYS.

name Jan. 30, 1940 LOCK FOR PROPELLING MACHINEB George Y. Anderson, In,and Trevor Davidson,

Milwaukee, and Bruno L.

Lonngren, South Milwaukee, Wls., assignors to Bucyrus-Erie Company,South Milwaukee, Win, a corporation oi Delaware Application October '22,1938, Serial No. 236,388

16 Claims.

Our invention relates to new and useful improvements in locks forpropelling machinery, and more particularly for the propelling machineryof a mobile crane, power-shovel, or the like, mounted on a turntable.

The traction units of such mobile outfits must be locked against motionwhen operating on a slope; and, even when on level ground, must belocked against being shifted by digging reactions and the like. The lockshould preferably be controlled from the upper revolving frame, but thisintroduces complications which are dimcult to meet. For example thereshould be provision to prevent the relative motion of the upperrevolving frame and the traction base from changing the setting of thelock. The lock should preferably be such as can be set to resist motionof the traction in either direction, in both directions, or in neitherdirection.

In addition to our principal object, above stated, we have worked out anumber of novel and useful details, which will be readily evident as thedescription progresses.

Our invention consists in the novel parts and in the combination andarrangement thereof, which are defined in the appended claims, and ofwhich four embodiments are exemplified in the accompanying drawings,which are hereinafter particularly described and explained, togetherwith several further variants of each of the four embodiments.

Throughout the description, the same reference number is applied to thesame member or to similar members. Y

Figure 1 is a vertical section of that portion of a, crane whichembodies our invention, taken along the lines Il of Figure 2. a

Figure 2 is a vertical section, taken along the lines 2-2 of Figure 1.

Figures 3 to 7 show an enlargement of our lock per se, in fivesuccessive positions of lever-setting.

Figure 8 shows one position of an alternative form of lock.

Figure 9 shows one position of another alternative form.

Figure 10 shows one position of still another alternative form.

Turning now to Figures 1 and 2 we see that II is the traction base of aturntable crane, supported on creeping traction l2 and I3. About apintle it, carried by base ll, turntable ll revolve's, this revolvingbeing accomplished by pinion' l6, carried by the turntable an engagingcircular rack ll carried by the base. Pinion I. is

rotated by an appropriate engine (not shown) 'on the turntable.

Gear ll on the turntable may be actuated by this same engine to conveypropelling power through hollow shaft l8 within the pintle, pinion 20,gear 2|, shaft 22, sprocket 23, chains 24, sprockets 25, and shafts 26to traction driving tumblers 21.

Shaft 22 also carries ratchet wheel 28, but this ratchet wheel mightjust as well be at some other point in the drive train, provided that itis constrained to rotate with any motion of the creeping traction.

Inasmuch as the steering of the creeping traction is usually eii'ectedby brakes and/or clutches (not shown) on the base, it is advisable thatratchet wheel 28 be likewise on the base. Furthermore the ratchet wheelmust be on the base to prevent rotation of the turntable from causingpropelling.

In Figure 1 there will be seen, in conjunction with ratchet wheel 28, asystem of two dogs and various rods connecting them. The elements ofthis system are not there numbered, inasmuch as the details thereof areshown in enlarged Figures 3 to 7, which will be discussed later herein.

From this system there extends a chain of control 29, through the centerof the shaft I 9 within the pintle I4, to a control-lever 29a on theturntable 15. See Figure 2 for this chain of control.

One of the elements of this chain of control is a lever 30, whichengages (in any conventional manner, as by a. spring-set latch)successive notches in a quadrant 3| or its equivalent, each notchcorresponding to one of the five (or other number) positions in thecycle of the control. Locating this quadrant device-on the traction baseis one of the important features of our in-' vention, inasmuch as thislocation prevents the relative vertical motion of the base and theturntable from altering the setting of the dog system. The operator canjudge the proper setting of lever 29a, by the fact that he can feel inthis lever 'the engagement of the spring-set latch on lever 30' with thesuccessive notches of quadrant 3|.

Turning now to Figures 3 to 'l for the details of the dog system, we seethat two dogs 32 and 33, free to rotate on respective shafts 34 and 35,opposingly enllage ratchet wheel 28. Am 36 and boss 31 rotate withlefthand dog 32. Arm 38 and boss 39 rotate with righthand dog 33.

Bellcrank II is free to rotate on lefthand shaft ll. Bellcrank ll isfree to rotate on 'righthand shaft 35. These bellcranks need notnecessarily be on the same shafts as their dogs; for example, they mighteach be on a shaft parallel to the shaft which carries the correspondingdog, and rotate oppositely to its dog. Rod 42 constrains these twobellcranks to rotate in unison. The long arm of lefthand bellcrank 40 isactuated by the train of control 29 shown in Figure 2.

Rod 43 extends from arm 33 on lefthand dog 32, and has at its furtherend a slot which engages arm 38 on righthand dog 33. Obviously this slotcould instead be on the lefthand end of this rod; and/or arm 36 couldextend downwardly and arm 38 upwardly.

In Figure -3, the long arm of lefthand bellcrank 40 is in its mostdepressed position. It engages boss 31 of lefthand dog 32 to such anextent as not only to raise this dog out oi. engagement; but also causesarm 33 of this dog to pull on lower rod 43 so far that the righthand endof its slot engages arm 38 on righthand dog 33, and raises that dog outof engagement too.

In Figure 4, the long arm of lefthand bellcrank 40 is not quite sodepressed. Its degree of depressing is sufficient to still engage boss31, and thus still hold lefthand dog raised out of engagement; but lowerrod 43 is not now pulled quite so far to the left as before, and so itsslot no longer constrains arm 38 to hold righthand dog 33 raised 40 isnow raised siificiently so as no longer to hold iefthand dog 32 raisedout of engagement.

In Figure 6, the further clockwise rotation of this bellcrank operatesthrough upper rod 42 to rotate righthand bellcrank 4i clockwisesuiiiciently far so that it engages boss 39 on righthand dog-33 and thusraises dog 33 out of engagement. In Figure 7, the further clockwiserotation of righthand bellcrank 4| raises righthand dog 33 still furtherso that its arm 33 now engages the lefthand end of the slot in lower rod43 and pushes this red to the left, thus acting on arm 36 of lefthanddog 32 to raise that dog out of engagement as well.

Thus the five successive positions of lei'thand bellcrank 43 give usfive successive situations of the.dogs 32 and 33 on the ratchet wheel28,

1.a:nely: (Fig. 3) both dogs out; (mg. 4) left dog nated. Instead wehave the slotted upper rod 44,

slidably actuated by the control means, and en gaging an arm 45 oflefthand dog 32, and an arm 46 of righthand dog 33. 'I'he other elementsfimction as before. I In Figure 9, the lower rod 43 has been eliminated.Upper rod '44, as before,'is slidably actuated by the control means. onits upper edge are two camways 41 and 43, respectively engaging wheels49 and 50 on respective dogs 32 and 33.

The extreme left position of rod 44 raises both wheels, thus releasingboth dogs. Aslight motion to the right releases wheel 43, .thuspermitting the engagement of lefthand dog 32. Further motion releaseswheel ill too, thus permitting the engagement of both dogs, as shown inFigure 9.

Further motion engages wheel.43, thus releasing lefthand dog 32. Stillfurther motion also engages wheel 30, thus releasing both dogs.

In this exempliflcation of our invention, in

means in any appropriate manner.

'aieasae place of quadrant 3| of Figure 2, we have in Figure 9 a seriesof notches 31 in the bar 44, engaging spring-impelled ball 58. In theclaims, the "means on the base, to releaseably hold the controlmeans ineach of the control positions is intended to include this device as analternative tothe quadrant.

In Figure 10, bellcrank 53 is mounted on a shaft 30, which shaft isrotatable by the control The two arms of the bellcrank are preferablyset at a rather wide angle to each other.

On each arm of the bellcrank is pivoted a rod 6|, having a slot toengage a pin 62 on the upstanding arm of one of the dogs.

In midposition the shaft 63 should be at such a level with respect tothe pins 82, and the arms of the bellcrank 59 should extend at such an,

angle 'to each other, that in that position each arm of the bellcrankwill extend appreciably above or below the line joiningthe shaft and theadjacent pin. The angular movement of the bellcrank 69 equivalent to onestep of the cycle should equal twice the angle between one arm of thebellcrank in its midposition, and the line Joining the shaft 63 and theadjacent pin 62.

In Figure 10, the angle between the two arms of the bellcrank happens tobe 120, and the angle between one arm and the line joining the shaft andthe adjacent pin happens to be 15, so that the angular movement of thebellcrank equivalent to each step of the cycle is. 30.

In the midpositiom, as shown, both dogs are out. Rotation of thebellcrank 59 through 30 clockwise permits righthand dog 32 to engage theratchet, while still holding lefthand dog 33 out. Rotation clockwisethrough 30 more permits lefthanddog 33 to engage, while leavingrighthand dog 32 still engaged. Conversely for,

two 30 counterclockwise movements.

The same bellcrank could have been employed inverted on the same shaft,with no other change in results than to'require reversal of thedirection of rotation of the shaft.

In our claims, when we refer to a two-way ratchet, we intend to coverequally the equivalent two opposed ratchet wheels, each lockable by one1 the dogs are shown as falling into place by their own weight, theymight of course be spring pressed.

It is to be understood that, although the orde of our cycle of fivepositions is considered by us to be the optimum; yet some differentorder and/or number of positions might be employed. For example,provision might be made to have the condition of both dogs out occupythe cen-- tral position in the cycle and the condition of both dogs inoccupy one or both of the extreme positions; and/or one of the twoextreme positions (and even the position next to it) might be omitted.

The first of these proposed alternatives could be accomplished. forexample, in the device of Figure 9 by substituting projections forhollows,

and vice versa, on the upper edge of rod. In 13 methods of inverting thedevice of Figure 10, it has already been accomplished. To invert thecycle of the device of Figure 10, so as to correspond with that of theother devices, all'that would be necessary would be to revolve bellcrank59 into an inverted position so that rods ii are crossed, and thenlengthen those rods somewhat. shaft 60 below the dogs, shorten the rodssomewhat, and extend stead of upwardly.

The second of these proposed alternatives could be accomplished, forexample, in the device' of Figure 9 either by limiting the leftward orrightward travel of rod 44, or by prolonging to the left or rightrespectively camway 41 or 48..

In the device of Figures 3 to 7, this could be accomplished by limitingthe clockwise or counterclockwise rotation of bellcrank 40, or bylengthening in one direction or the other the slot in rod 43. In thedevice of Figure 8, this could be accomplished by limiting the leftwardor. rightward travel of rod 44, or by lengthening in one direction orthe other the slot in rod 43. In the device of Figure 10, this could beaccomplished by limiting the rotation of bellcrank 59 in one direction.1

Although we have worked out appropriate the cycle of the device ofFigures 3 to 7 and the device of Figure 8, these methods would requireadditional drawings for the exemplification, and so will not be givenhere.

Other similar changes can be' made, it some other cyclical order ofoperations is desired.

Having now described and illustrated four forms of our invention, wewish it to be understood that our invention is not to be limited to thespecific form or arrangement of parts herein described and shown, orspecifically covered by our claims.

We claim:

1. In a mobile crane or the like, the combination of a traction base; aturntable, mounted thereon; -means, onthe base, for locking thetraction; control means, extending from the locking means to theoperator's station on the turntable; and means on the base, toreleasably hold the control means in each of its control positions.

2. In a mobile crane or the like, the combination of: a traction base; aturntable, mounted thereon; a two-way ratchet, constrained to rotatewith the traction; a dog to oppose the rotation of this ratchet in onedirection; a dogto oppose the rotation of the ratchet in the oppositedirection; control means, extending from the dogs to the operator'sstation on the turntable; a con,- trol lever for this control means, thelever having four positions as follows: (1) both dogs out, (2) one dogin and the other dog out, (3) both dogs in, and (4) the other dog in andthe one dog out; and means on the base, to releasably hold the controlmeans in each of its control positions.

3. In a ratchet two-way ratchet; a dog device, the combination of: a

for the ratchet; a second dog for the ratchet, opposed to the first dog;

control means; means, actuated by the control means, and having fourpositions, namely: .(1) to extremely raise one dog, (2) to barelyrelease that dog, (3) to release neither dog, and (4) to barely releasethe other dog; and means, interconnecting the two dogs, whereby extremeraising of one dog will release the other.

4. In a ratchet device,- the combination of: a two-way ratchet; a dogfor the ratchet; a sec- Or simpler still, place dog arms 62 downwardlyintwo-way ratchet;

ond dog for the ratchet, opposed to the first dog; control means; means,actuated by the control means, and capable of raising or lowering thedogs individually; and interconnecting means, whereby extreme actuationof the control means in the direction to actuate one dog will similarlyactuate the other dog. I

5. In a ratchet device, the combination of: a two-way ratchet; a dog forthe ratchet; a second dog for the ratchet, opposed to the first dog;control means; a rod actuated by the controlmeans, and having anoperative connection with each of the two dogs in such a way thatdifierent positions of this rod will either (1) extremely raise one dog,or (2) will barely release that dog, or (3) will releaseneither dog, or(4) will barely release the other dog; and means interconnecting the twodogs, whereby extreme raising of one dog will release the other.

6. In a ratchet device, the combination of: a

a dog for the ratchet; a second dog for the ratchet, opposed to thefirst dog; control means; a rod actuated by the control means, andhaving an operative connection with each of the two dogs, such thatmotion of the rod in one direction will release one of the dogs withoutreleasing the other; and means interconnecting the two dogs, wherebyextreme raising of one dog will release the other.

7. In a ratchet two-way ratchet; a shaft; a dog for the ratchet, mountedon the shaft; a second shaft; a second dog for the ratchet, mounted onthe second shaft and opposed to the first dog; two rotating elements,one being mounted-on each shaft; control means to rotate the twoelements in unison; means on the first dog, when the elements arerotated in one direcdevice, the combination of: a

element torelease the first tion; means on the second element to releasethe second dog when the elements are rotated in the other direction; anda rod, having a fixed pivotal connection with one of the dogs, and areverse-rotation sliding connection with the other.

8. In a ratchet device, the combination of: a two-way ratchet; a dog forthe ratchet; a second dog for the ratchet,'opposed to the first dog;control means; means, actuated by the control means, and having fourpositions, namely (1) to extremely raise one dog, (2) to barely releasethat dog, (3) to release neither dog, and (4) to barely release theother dog; and a rod, having a fixed pivotal connection with one of thedogs, and a reverse-rotation sliding pivotal connection with the other.i

9. In a ratchet device, the combination of: a two-way ratchet; a dog forthe ratchet; a second dog for the ratchet, opposed to the first dog;control means; a rod actuated by the control means, and having anoperative connection with each of the two dogs in such a way thatdifferent positions of this rod will either (1) extremely raise one dog,or (2) barely release that dog, or (3) release neither dog, or (4)barely release the other dog; and a rod, having a fixed pivotalconnection with one of the dogs, and a reverse-rotation sliding pivotalconnection with the other.

10. In a ratchet device, the combination of: a two-way ratchet; a dogfor the ratchet; a second dog for the ratchet, opposed to the first dog;control means, a rod actuated by the ,control means, and having anoperative connection with each or the two dogs, such that motion of therod in either direction will release one of the dog's without releasingthe other; and a rod, having a fixed pivotal connection with one 01 thedogs, and a reverse-rotation sliding pivotal connection with the other.

11. In a ratchet device, the combination of: a two-way ratchet; a dogfor the ratchet; a second dog for the ratchet, opposed to control means;and a rod actuated by the control means, and having an operativeconnection lease bothdogs, or (2) release only one dog, or (3) releaseneither dog, or (4) release only the other dog. r

12. In a ratchet device. the combination of: a two-way ratchet; a dogfor the ratchet; a second dog for the ratchet, opposed to the first dog;control means to release the other dog; and a sliding cam, actuated bythe control means, to engage these two last mentioned means in .such away as successivelyto (1) release both dogs, (2) release only one dog,(3) release neither dog, (4) release only the other dog, and (5) releaseboth dose.

1 3. In a ratchet device, the combination of: a two-way ratchet; a dogfor the ratchet; a second, dog for the ratchet, opposed to the firstdog; control means; means, to release one dog; means to release theother dog; and a sliding cam, actuated by the control means, to engagethese two last-mentioned means in such a way as either (1). to releaseboth dogs,

or (4) to release neither dog.

the first dog;

a lease only the other dog.

means; means to release one dog;

or (2) to release only one dog, or (3) to release only the other dog,

14. In a ratchet device, the combination of: a two-way ratchet; a dogfor theratchet; asecond dog for the ratchet. opposed to the first dog;control means; and a bellcrank actuated by the control means; and havingan operative connec- 5 tion with each of the two dogs in such a way thatdifl'erent positions of this bellcrank will either (1) release bothdogs, or (2) release only one dog, or (3) release neither dog, or (4)re- 15. In a ratchetdevice, the combination of: a two-way ratchet; a dogfor the ratchet; a second dog for the ratchet, opposed to the first dog;control means; and a bellcrank actuated by the control means; and tworods, each pivotally con-- necting one arm or the bellcrank with onedog, one of each pair of pivotal connections being sliding. p

l6. Inaratchet device, the combination oi: atwo-way ratchet; a dog forthe ratchet; a second dog for the ratchet, opposed to the first dog;control means; and a bellcrank actuated by the ntrol means; and tworods, each pivotally connecting one arm of the bellcrank with one dog,one 01' each pair of pivotal connections being sliding; the bellcrankbeing so proportioned and so located with respect to the dogs, thatrotation oi the bellcrank one cycle-step in either direction from itsmid position will leave the actuation of one dog virtually unchanged.

- GEORGE Y. ANDERSON, JR.

TREVOR DAVIDSON. BRUNO L. IONNGREN.

